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N 175,515. Patent-ed Match 28,1876.

fkTTcsT: INVENTORSZ MPEYERS, FNOTO-UTHOGRAFNEIL WASHINGTON. D. C.

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H. SM I M & I. HUPFEL-D.

I SPRING BED-BOTTOM.

Patented March 28, 1876.

J'NVENT-ORS ILPETERS, FtlOTO-UTMOGRAPNEB, WASHINGTON. D C

HENRY SMIDT AND JOHN HUPFELD, OF NEW YORK, N. Y.

IMPROVEMENT IN SPRING BED-BOT-TOMS.

Specification forming part of Letters Patent No. 175,516, dated March 28, 1876; application filed November 3, 1875.

To all whom it may concern Be it known that We, HENRY SMIDT and JOHN HUPFELD, both of the city, county, and State of New York, have invented certain Improvements in Spring Bed-Bottoms, of which the following is a specification:

The object of this invention is to provide a bottom that will yield equally all over with 1 an unequally-distributed pressure; and it consists, essentially, in the construction and arrangement of the springs andv equalizing-carriers for accomplishing the said object, as will be hereinafter described.

In the drawings, Fig. 1 is a longitudinal vertical mid-section of our improved bed-bottom. Fig. 2 is a transverse vertical section of the same. Figs. 3 and 4 are, respectively, side and end views of a modification of the carrier and spring.

Let A A represent the posts of a bedstead, l B the head and foot boards, and O G the rails. To the inner faces of these rails are attached cleats D D for supporting the elastic bottom. In, the precise construction shown E E are longitudinal slats for the support of the bedding. These rest on and are secured to two or more equalizing-carriers, F F, arranged at proper distances apart, and resting on the cleats D D. -The ends of the slats rest upon springs G G of peculiar construction. The lower ends of these springs are secured to cross-ties H H, which, in turn, rest upon and are secured to strips H H, secured to the bottoms of the carriers.

The carriers FF are constructed as follows: A lower and upper pair of ties, at a, are arranged to receive and embrace the ends of three diagonals, b b, which are crossed, and pivoted together at their point of crossing by a bolt, 0, said bolt passing through all three, as shown. The diagonals are pivoted to the ties a a at the ends by means of pivot-bolts d d, and all are held together by nuts.

It will be observed, however, that at one end of the ties the bolts d d engage slots 0 e in the ties, this being necessary to permit the proper extension of the diagonals when the carrier is compressed. This movement is clearly indicated by the dotted lines in Fig. 3. Suitable washersffwill be required to fill the vacancies left by the diagonals on the bolts (1 d, as indicated. The springs G G keep the carriers expanded, and when the springs are compressed the carriers yield to the pressure, but their function is to cause the bottom to yield equally to unequal pressure and preserve the level of the surface. This they accomplish by distributing the pressure exerted upon any point equally throughout.

The form of spring used is the double or triple reverse curve, and they are preferably constructed of one leaf of spring metal. In some cases it may be preferable to arrange the springs on each side of the carrier, as shown in Figs. 3 and 4.

At one end of the slatted bottom we have shown an adjustable section, lettered I, provided with suitable means for elevating it to any desired angle; but as this forms no part of our present invention we will not more fully describe it.

We claim 1. In a spring bed-bottom, the carrier F, composed of the cross-ties a a, diagonals b b, and bolts odd, when constructed and arranged to operate substantially as set forth.

2. The combination of the carrier or carriers F F, constructed as specified, with the springs G G and slats E E. substantially as set forth.

In witness whereof we have hereunto signed our names in the presence of two subscribing witnesses.

HENRY SMIDT. JOHN HUPFELD.

Witnesses;

HENRY OoNNETT, HENRY A. DIERKES. 

